How about something like:
I like posting here in general, but I am no longer comfortable discussing politics here, because discussions tend to get polarized and sometimes political discussions lead to posters calling each other names in the pit. Can you recommend other sites where i can engage in vigorous political discussions, with both liberals and conservatives, but where “pit-like” posting is forbidden?
Notice that i didn’t insult anyone, and i don’t even think i said anything controversial. I didn’t suggest anything about bigoted posters, nor accusations thereof. Could that op go off-topic? Sure. But it’s much less likely to, since it’s unlikely to piss off anyone.
Notice also that i didn’t drag in the suggestion of shutting down the pit, just saying that “i” (or you) prefer something different. I kept it focused on what i believe your request is.
Look at the very first response you got. It was already pretty much fated.
Also, I’m also curious what you meant by “flouncing”. (Pretty sure that was the question mis-spelled here: